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Story highlights

Ambassador Christopher Stevens was in Benghazi to talk to officials about weapons stockpiles

Stevens and information officer holed up in safe room in compound

Two Navy SEALs were killed while fighting off attack on other Americans in Benghazi

(CNN)September 11, 2012, in America was a day of solemn remembrance. In Libya, it was a day of violence that ended with four Americans killed, starting a debate over whether the Obama administration should have better protected them and whether it tried to cover its tracks after the debacle.

Ambassador Christopher Stevens was in Benghazi that day to meet with officials over the hunt for ousted dictator Moammar Ghadafi's weapons stockpiles and to open a cultural center. Here is how events played out that day (all times local):

9:40 p.m.: Gunfire is heard outside the Benghazi diplomatic mission, then a loud explosion. Dozens of armed militiamen charge the main gate and set fire to a barracks building as they make for the ambassador's residence.

Correction

An earlier version of this article misidentified the diplomat who was deputy mission chief in Benghazi, Libya, at the time of the 2012 attacks. He was Gregory Hicks.

10 p.m.: Attackers breach the mission walls and make for the ambassador's residence. Stevens and information officer Sean Smith run to a safe room with one security agent.

An alert is sent to the CIA security team at an annex about a mile away, the State Department and the U.S. Embassy in Tripoli. Stevens calls deputy mission chief Gregory Hicks at the embassy and tells him, "Greg, we're under attack."

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10:30 p.m.: Stevens and Smith have taken refuge behind a fortified door with heavy metal bars that keeps the attackers from breaking in, but they set fire to the villa with diesel fuel. Within minutes, Stevens and Smith are overwhelmed by smoke.

At about the same time, six U.S. security agents leave the CIA annex for the main building. They and 16 Libyan security guards regain control over the compound and start searching for Stevens and Smith.

1:15 a.m.: A rescue team from Tripoli arrives in Benghazi. About 30 Americans have been rescued from the consulate building and are holed up with the Stevens at the CIA annex.

2 a.m.: Hicks informs Secretary of State Hillary Clinton that they need to evacuate all Americans from Benghazi. At about the same time, an eyewitness captures on video Stevens being pulled from the smoke-filled building.

4 a.m.: The attackers launch a full-on assault against the annex, dropping mortars on the roof. Navy SEALs Glen Doherty and Tyrone Woods are killed in the attack.

10 a.m.: The bodies of Stevens, Smith, Doherty and Woods are put on the last plane out of Benghazi.